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,. , . ~r,;..\ .. 5 (. than with weather rrodification programs per see Nornul safety precautions observed when handling flanmble mterials such as prop:u1e and acetone are probably adequate. There is little likelihood of ingesting enough o~..the naterial or inha~ing quantities which might cause problems. Some extra care nay be need.ed in handling some of the organic seeding rraterials like rretal dehyde in a confined area like a seeding aircraft. ww or rroderate levels of concern might be anticipat.ed from weather rrodification operators or applied scientists and regulatory agencies such as C6HA or the Public Health Service. RecoII1l'n2!ldations No additional action or research is recomrended. Issue 10: Iodine As A Reactive Component Some low-level concern has been expressed by segments of the lay public and legislatures with perhaps a somewhat greater (interm2diate) level of concern by applied scientists and general government ageilcies. Regarding iodine ion, this does not appear to be a meaningful environrne.ntal issue, due to the widespread use of KI in salt and the general lack of toxicity of the salts without an oxidant by which ITBtallic iodine can be formed. Iodide, ,in the form of metal excess halide complexes formed in the nucleant generation process, represents another type of issue which is of scientific, but not particularly of lay public concern. The SOlubility and ITOvement of silver as excess halide complexes into lipid membrane zones my be related to p:::>tentiation of other metals, pesticides or other compounds. c. Recornrendations WOrk on the chemistry and biology of halide complexes (especially on trans- formation incorr:oration into general enviroI1ITl""-..ntal metal r:ools) should be supported, as this relates to many issues perceived predominantly by scientists. From the lay public standpoint this will not be a particularly important issue. Issue 11: l1ethodology of Detection Refinanent of methodology for toth sampling and detection of Ag is a critical issue arrDng many issue-raising groups. with the advent of atomic adsorption techniques, including the use of extrerrely sensitive flameless atomic analysis, the detection limit for Ag over other metals has improved rrarkedly. However, suitable methods for separating forms and levels of Ag species within a sample are lacking. Moreover , effective means for obtaining representative air, water, or soil samples must be forthcoming in order to provide rreaningful ITOni toring data. Another aspect of detection is that raised by public interest groups when the question of whether seeding has or has not occurred. Hethods to detennine if precipitation is derivoo from seeded storms could clarify sorre legal problems, and perhaps increase liability of various groups if cause effect relationships could be established with greater certainty. ,-.... l.,.. .'